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amp meter/ volt meter

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(@906co470)
Posts: 37
Eminent Member
Topic starter
 

I am converting my Stinson to an O-470 with a belt driven 70 amp max alternator. What problems will I have if I leave the original 40 amp gauge in the panel? Does it need changed out to something that would indicate the max amp of the alternator. The plane has none of the original wiring left. All self resetting breakers have been changed out to new style. All circuits are protected. All updated to handle the potential load and for safety. Other option is to scrap the amp gauge and install a voltmeter. Any suggestions appreciated. Thanks

Eddie Stewart
Elmore City, Oklahoma
N906C 108-3 Continental O-470

 
Posted : 01/01/2019 4:51 am
Posts: 286
Reputable Member
 

What does the STC for the engine installation say?

 
Posted : 01/01/2019 11:32 am
(@jcessna)
Posts: 55
Trusted Member
 

Hi; I'm sure you will need a different ammeter. ECI sells a digital voltmeter/ ammeter in one guage.

Jim

 
Posted : 02/01/2019 2:50 am
(@906co470)
Posts: 37
Eminent Member
Topic starter
 

What does the STC for the engine installation say?
The engine STC assumes you are using a generator that is not any more powerful than the original Stinson equipment. I found on the alternator STC where the amp meter needs to be changed to an appropriate meter for the installation "IF" you want to run one. The alternator STC really does not require a volt or amp gauge as long as you install the alternator inop warning light.

Eddie Stewart
Elmore City, Oklahoma
N906C 108-3 Continental O-470

 
Posted : 04/01/2019 4:39 am
Charles L Gruby Gruby
(@charlesgruby)
Posts: 72
Trusted Member
 

I agree with everyone else, but just to add, the alternator on the O-470 will probably have an output greater than 40 amps, and even though you wouldn't normally be putting out that much, whenever you did, it would peg the meter and possibly burn it out. You should have an meter that matches the output of the alternator, plus a small margin.

Chuck Gruby
Stinson 108-2 NC9502K
Petal, MS

 
Posted : 04/01/2019 2:14 pm
(@jcessna)
Posts: 55
Trusted Member
 

Hello; A few more two cents from me. I agree with Chuck unless you have installed a shunt all the alternator output will pass through the ammeter,
our old factory ammeter will burn out.

Jim

 
Posted : 04/01/2019 8:58 pm
(@906co470)
Posts: 37
Eminent Member
Topic starter
 

Thanks guys. I was trying to keep as much original look to the panel as possible. Guess I will throw that out and purchase one of the 100 amp capable volt/ amp digital gauge. Looks like the best solution for what I need.

Eddie Stewart
Elmore City, Oklahoma
N906C 108-3 Continental O-470

 
Posted : 07/01/2019 5:39 am
Posts: 9
Active Member
 

One thing you might want to take into consideration is the wiring. Original wire size in the Stinson is meant for a 25 amp system I believe it is 10 gage wire. Kick it up to 70 amps you're going to have to increase Wire size. If you put 70 A through a number 10 wire it's going to turn Into a fire hazard. I have the 25 amp generator works great supplies more than enough power. I have replaced the landing light with LED they draw much less power than the standard landing light and with the newer radios. I can't understand why more power would be necessary.

 
Posted : 09/03/2019 1:56 am
Posts: 30
Eminent Member
 

Smitty, all wiring in the plane is new and has been sized according to max amp draw for each circuit with an appropriate breaker in place for each circuit. I did not think my original question through before asking if a 40 amp gauge would handle a 70 amp circuit. That one was glaringly obvious. Thanks all for the replies.

Sent from my iPhone using Tapatalk

 
Posted : 11/03/2019 5:08 am
Posts: 37
Eminent Member
 

Eddie, could you share the details of your new wiring? I will have to completely rewire mine and I plan to use all LED and an alternator, but interested to see what gauges you used for each circuit.

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Thank you.

 
Posted : 11/03/2019 1:55 pm
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